On 8/5/2020 08:51, Mike Rapoport wrote:

From: Mike Rapoport rppt@linux.ibm.com

When a configuration has NUMA disabled and SGI_IP27 enabled, the build fails:

CC kernel/bounds.s CC arch/mips/kernel/asm-offsets.s In file included from arch/mips/include/asm/topology.h:11, from include/linux/topology.h:36, from include/linux/gfp.h:9, from include/linux/slab.h:15, from include/linux/crypto.h:19, from include/crypto/hash.h:11, from include/linux/uio.h:10, from include/linux/socket.h:8, from include/linux/compat.h:15, from arch/mips/kernel/asm-offsets.c:12: include/linux/topology.h: In function 'numa_node_id': arch/mips/include/asm/mach-ip27/topology.h:16:27: error: implicit declaration of function 'cputonasid'; did you mean 'cpu_vpe_id'? [-Werror=implicit-function-declaration] #define cpu_to_node(cpu) (cputonasid(cpu)) ^~~~~~~~~~ include/linux/topology.h:119:9: note: in expansion of macro 'cpu_to_node' return cpu_to_node(raw_smp_processor_id()); ^~~~~~~~~~~ include/linux/topology.h: In function 'cpu_cpu_mask': arch/mips/include/asm/mach-ip27/topology.h:19:7: error: implicit declaration of function 'hub_data' [-Werror=implicit-function-declaration] &hub_data(node)->h_cpus) ^~~~~~~~ include/linux/topology.h:210:9: note: in expansion of macro 'cpumask_of_node' return cpumask_of_node(cpu_to_node(cpu)); ^~~~~~~~~~~~~~~ arch/mips/include/asm/mach-ip27/topology.h:19:21: error: invalid type argument of '->' (have 'int') &hub_data(node)->h_cpus) ^~ include/linux/topology.h:210:9: note: in expansion of macro 'cpumask_of_node' return cpumask_of_node(cpu_to_node(cpu)); ^~~~~~~~~~~~~~~

Before switch from discontigmem to sparsemem, there always was CONFIG_NEED_MULTIPLE_NODES=y because it was selected by DISCONTIGMEM. Without DISCONTIGMEM it is possible to have SPARSEMEM without NUMA for SGI_IP27 and as many things there rely on custom node definition, the build breaks.

As Thomas noted "... there are right now too many places in IP27 code, which assumes NUMA enabled", the simplest solution would be to always enable NUMA for SGI-IP27 builds.

Reported-by: kernel test robot lkp@intel.com Fixes: 397dc00e249e ("mips: sgi-ip27: switch from DISCONTIGMEM to SPARSEMEM") Cc: stable@vger.kernel.org Signed-off-by: Mike Rapoport rppt@linux.ibm.com

---

arch/mips/Kconfig | 1 + 1 file changed, 1 insertion(+)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 6fee1a133e9d..a7e40bb1e5bc 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -678,6 +678,7 @@ config SGI_IP27 select SYS_SUPPORTS_NUMA select SYS_SUPPORTS_SMP select MIPS_L1_CACHE_SHIFT_7

• select NUMA help This are the SGI Origin 200, Origin 2000 and Onyx 2 Graphics workstations. To compile a Linux kernel that runs on these, say Y

Reviewed-by: Joshua Kinard kumba@gentoo.org